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DTC B3881 or B3882

DTC B3881 or B3882

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC B3881 02

Tail Lamp Circuit Short to Ground

DTC B3881 04

Tail Lamp Circuit Open

DTC B3882 02

Right Tail Lamp Circuit Short to Ground

DTC B3882 04

Right Tail Lamp Circuit Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Left Stop Lamp Control B3881 02 B3881 04 1 -
Right top Lamp Control B3882 02 B3882 04 1 -
1. Stop Lamps Always ON


Circuit/System Description

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal to the body control module (BCM). The BCM will apply battery voltage to the right, left and center stop lamp control circuits.

Conditions for Running the DTC

Brake pedal is applied.

Conditions for Setting the DTC

B3881 01

The BCM detects a short to voltage on the left rear brake lamp control circuit.

B3881 02

The BCM detects a short to ground on the left rear brake lamp control circuit.

B3882 01

The BCM detects a short to voltage on the right rear brake lamp control circuit.

B3882 02

The BCM detects a short to ground on the right rear brake lamp control circuit.

Action Taken When the DTC Sets

The appropriate brake lamp will be inoperative.

Conditions for Clearing the DTC


• The DTC will be current for as long as the fault is present.

• When the fault is no longer present, the DTC will be a history DTC.

• A history DTC will clear after 50 ignition cycles.


Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, observe the function of the E5L stop lamp-left while commanding the Left Brake Lamp ON and OFF with a scan tool. The E5L stop lamp-left should turn ON and OFF while changing between the commanded states

2. Observe the function of the E5R stop lamp-right while commanding the Right Brake Lamp ON and OFF with a scan tool. The E5R stop lamp-right should turn ON and OFF while changing between the commanded states


Circuit/System Testing


1. Ignition OFF, disconnect the X1 harness connector at the appropriate E5 tail lamp.

2. Test for less than 30 Ω between the ground circuit terminal C and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance

4. Connect a test lamp between the control circuit terminal A and ground

5. Ignition ON, command the Brake Lamp ON and OFF with a scan tool, the test lamp should turn ON and OFF when changing between the commanded states.

6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

7. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

8. If all circuits test normal, test or replace the E5 tail lamp.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Tail Lamp Replacement

• Control Module References for BCM replacement, setup, and programming